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Summary of Significant Accounting Policies (Schedule of Accumulated Other Comprehensive Income (loss)) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | $ 13,372 | $ (6,981) | $ 20,035 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (52,526) | (8,890) | (8,865) |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | 3,042 | (287) | (1,643) |
Other comprehensive income (loss) | 65,898 | 1,909 | 28,900 |
Equity | 155,653 | 201,762 | 184,722 | $ 109,055
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 3,511 | 3 | (2,008) |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Before reclassification, beforeTax | 11,794 | (1,256) | 3,800 |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax | 1,935 | (6,464) | 23,932 |
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 17,240 | (7,717) | 25,724 |
OCI, Foreign Currency Transaction and Translation Gain (Loss), Arising During Period, Tax | (469) | (290) | 365 |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Before reclassification, Tax | (2,977) | (374) | (842) |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax | (422) | 1,400 | (5,212) |
Other Comprehensive Income (Loss) before Reclassifications, Tax | (3,868) | 736 | (5,689) |
Unrealized foreign currency translation adjustment (net of tax expense of $469 in 2023, net of tax expense of $290 in 2022 and net of tax benefit of $365 in 2021) | 3,042 | (287) | (1,643) |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Before reclassification, afterTax | 8,817 | (1,630) | 2,958 |
Net gains (losses) and prior service costs (net of tax expense of $422 in 2023, net of tax benefit of $1,400 in 2022 and net of tax expense of $5,212 in 2021) | 1,513 | (5,064) | 18,720 |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax | 0 | 0 | 0 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | (7,580) | (2,461) | (5,513) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax | 101,323 | 13,606 | 16,862 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 93,743 | 11,145 | 11,349 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI Including Earnings Of Actuarial Loss For Pension Settlement, Tax | (43,261) |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Income Tax (Expense) Benefit, Tax | 2,044 |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Tax | 0 | 0 | 0 |
Reclassification from AOCI, Current Period, Tax |  | 710 | 1,192 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax | (1,968) | (2,965) | (3,676) |
Other Comprehensive Income (Loss) Reclassifications, Tax | (41,217) | (2,255) | (2,484) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Including Earnings Of Actuarial Loss For Pension Settlement, after Tax | 58,062 |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax | 0 | 0 | 0 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (5,536) | (1,751) | (4,321) |
Amortization of prior service costs and net gains or losses (net of tax expense of $1,968 in 2023, net of tax expense of $2,965 in 2022 and net of tax expense of $3,676 in 2021) | 7,065 | 10,641 | 13,186 |
Other Comprehensive Income (Loss), Derivatives, Net of Tax | 3,281 |  |  |
Derivative financial instruments adjustment (net of tax expense of $933 in 2023, net of tax benefit of $336 in 2022 and net of tax benefit of $351 in 2021) |  | (3,381) | (1,363) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | 59,575 | 5,577 | 31,906 |
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Equity | (83,037) | (86,079) | (85,792) | (84,149)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Equity | 801 | (2,480) | 901 | 2,264
Pension And Other Postretirement Benefit Adjust |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Equity | 539 | (59,036) | (64,613) | (96,519)
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (147,595) | (149,504) | (178,404) |
Equity | (81,697) | (147,595) | (149,504) | $ (178,404)
Net gains (losses) and prior service costs (net of tax expense of $422 in 2023, net of tax benefit of $1,400 in 2022 and net of tax expense of $5,212 in 2021) |  | (5,064) | 18,720 |
Amortization of prior service costs and net gains or losses (net of tax expense of $1,968 in 2023, net of tax expense of $2,965 in 2022 and net of tax expense of $3,676 in 2021) | 7,065 | 10,641 | 13,186 |
Ending balance | $ (81,697) | $ (147,595) | $ (149,504) |

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